diff --git a/src/actions-util.ts b/src/actions-util.ts
index 251e804e7..9782bfb5e 100644
--- a/src/actions-util.ts
+++ b/src/actions-util.ts
@@ -7,7 +7,7 @@ import * as github from "@actions/github";
 import * as io from "@actions/io";
 
 import type { Config } from "./config-utils";
-import { Env, EnvVar } from "./environment";
+import { Env, EnvVar, ActionsEnvVars } from "./environment";
 import { Logger } from "./logging";
 import {
   doesDirectoryExist,
@@ -22,28 +22,6 @@ import {
  */
 declare const __CODEQL_ACTION_VERSION__: string;
 
-/**
- * Enumerates known GitHub Actions environment variables that we expect
- * to be set in a GitHub Actions environment.
- */
-export enum ActionsEnvVars {
-  GITHUB_ACTION_REPOSITORY = "GITHUB_ACTION_REPOSITORY",
-  GITHUB_API_URL = "GITHUB_API_URL",
-  GITHUB_EVENT_NAME = "GITHUB_EVENT_NAME",
-  GITHUB_EVENT_PATH = "GITHUB_EVENT_PATH",
-  GITHUB_JOB = "GITHUB_JOB",
-  GITHUB_REF = "GITHUB_REF",
-  GITHUB_REPOSITORY = "GITHUB_REPOSITORY",
-  GITHUB_RUN_ATTEMPT = "GITHUB_RUN_ATTEMPT",
-  GITHUB_RUN_ID = "GITHUB_RUN_ID",
-  GITHUB_SERVER_URL = "GITHUB_SERVER_URL",
-  GITHUB_SHA = "GITHUB_SHA",
-  GITHUB_WORKFLOW = "GITHUB_WORKFLOW",
-  RUNNER_NAME = "RUNNER_NAME",
-  RUNNER_OS = "RUNNER_OS",
-  RUNNER_TEMP = "RUNNER_TEMP",
-}
-
 /**
  * Abstracts over GitHub Actions functions so that we do not have to stub
  * global functions in tests.
diff --git a/src/api-client.test.ts b/src/api-client.test.ts
index affb5b894..34a72f14e 100644
--- a/src/api-client.test.ts
+++ b/src/api-client.test.ts
@@ -6,6 +6,7 @@ import * as sinon from "sinon";
 import * as actionsUtil from "./actions-util";
 import * as api from "./api-client";
 import { DO_NOT_RETRY_STATUSES } from "./api-client";
+import { ActionsEnvVars } from "./environment";
 import { getTestEnv, setupTests } from "./testing-utils";
 import * as util from "./util";
 
@@ -21,14 +22,8 @@ test.serial("getApiClient", async (t) => {
   pluginStub.returns(githubStub);
 
   const env = getTestEnv();
-  env.set(
-    actionsUtil.ActionsEnvVars.GITHUB_SERVER_URL,
-    "http://github.localhost",
-  );
-  env.set(
-    actionsUtil.ActionsEnvVars.GITHUB_API_URL,
-    "http://api.github.localhost",
-  );
+  env.set(ActionsEnvVars.GITHUB_SERVER_URL, "http://github.localhost");
+  env.set(ActionsEnvVars.GITHUB_API_URL, "http://api.github.localhost");
 
   sinon.stub(actionsUtil, "getRequiredInput").withArgs("token").returns("xyz");
 
diff --git a/src/api-client.ts b/src/api-client.ts
index a4a80cd48..eafac7ec7 100644
--- a/src/api-client.ts
+++ b/src/api-client.ts
@@ -2,12 +2,8 @@ import * as core from "@actions/core";
 import * as githubUtils from "@actions/github/lib/utils";
 import * as retry from "@octokit/plugin-retry";
 
-import {
-  ActionsEnvVars,
-  getActionVersion,
-  getRequiredInput,
-} from "./actions-util";
-import { EnvVar, ReadOnlyEnv, getEnv } from "./environment";
+import { getActionVersion, getRequiredInput } from "./actions-util";
+import { EnvVar, ReadOnlyEnv, ActionsEnvVars, getEnv } from "./environment";
 import { Logger } from "./logging";
 import { getRepositoryNwo, RepositoryNwo } from "./repository";
 import {
diff --git a/src/config/remote-file.test.ts b/src/config/remote-file.test.ts
index c36637029..ac1492d90 100644
--- a/src/config/remote-file.test.ts
+++ b/src/config/remote-file.test.ts
@@ -1,7 +1,7 @@
 import test from "ava";
 import sinon from "sinon";
 
-import { ActionsEnvVars } from "../actions-util";
+import { ActionsEnvVars } from "../environment";
 import * as errors from "../error-messages";
 import { Feature } from "../feature-flags";
 import { callee, getTestEnv } from "../testing-utils";
diff --git a/src/config/remote-file.ts b/src/config/remote-file.ts
index 15990ed23..15b34af2b 100644
--- a/src/config/remote-file.ts
+++ b/src/config/remote-file.ts
@@ -1,6 +1,5 @@
 import { ActionState } from "../action-common";
-import { ActionsEnvVars } from "../actions-util";
-import { Env } from "../environment";
+import { Env, ActionsEnvVars } from "../environment";
 import * as errorMessages from "../error-messages";
 import { Feature } from "../feature-flags";
 import { ConfigurationError, Failure, Result, Success } from "../util";
diff --git a/src/environment.ts b/src/environment.ts
index 7bda149d5..663a6396d 100644
--- a/src/environment.ts
+++ b/src/environment.ts
@@ -164,6 +164,31 @@ export enum EnvVar {
   RISK_ASSESSMENT_ID = "CODEQL_ACTION_RISK_ASSESSMENT_ID",
 }
 
+/**
+ * Enumerates known GitHub Actions environment variables that we expect
+ * to be set in a GitHub Actions environment.
+ */
+export enum ActionsEnvVars {
+  GITHUB_ACTION_REPOSITORY = "GITHUB_ACTION_REPOSITORY",
+  GITHUB_API_URL = "GITHUB_API_URL",
+  GITHUB_EVENT_NAME = "GITHUB_EVENT_NAME",
+  GITHUB_EVENT_PATH = "GITHUB_EVENT_PATH",
+  GITHUB_JOB = "GITHUB_JOB",
+  GITHUB_REF = "GITHUB_REF",
+  GITHUB_REPOSITORY = "GITHUB_REPOSITORY",
+  GITHUB_RUN_ATTEMPT = "GITHUB_RUN_ATTEMPT",
+  GITHUB_RUN_ID = "GITHUB_RUN_ID",
+  GITHUB_SERVER_URL = "GITHUB_SERVER_URL",
+  GITHUB_SHA = "GITHUB_SHA",
+  GITHUB_WORKFLOW = "GITHUB_WORKFLOW",
+  RUNNER_NAME = "RUNNER_NAME",
+  RUNNER_OS = "RUNNER_OS",
+  RUNNER_TEMP = "RUNNER_TEMP",
+}
+
+/** A type representing all known environment variables. */
+export type KnownEnvVar = EnvVar | ActionsEnvVars;
+
 /**
  * Gets an environment variable, but throws an error if it is not set.
  */
diff --git a/src/testing-utils.ts b/src/testing-utils.ts
index c6ff0dbda..e78d6a616 100644
--- a/src/testing-utils.ts
+++ b/src/testing-utils.ts
@@ -11,7 +11,7 @@ import nock from "nock";
 import * as sinon from "sinon";
 
 import { ActionState, StateFeature } from "./action-common";
-import { ActionsEnv, ActionsEnvVars, getActionVersion } from "./actions-util";
+import { ActionsEnv, getActionVersion } from "./actions-util";
 import { AnalysisKind } from "./analyses";
 import * as apiClient from "./api-client";
 import { GitHubApiDetails } from "./api-client";
@@ -19,7 +19,7 @@ import { CachingKind } from "./caching-utils";
 import * as codeql from "./codeql";
 import { Config } from "./config-utils";
 import * as defaults from "./defaults.json";
-import { Env } from "./environment";
+import { Env, ActionsEnvVars } from "./environment";
 import {
   CodeQLDefaultVersionInfo,
   Feature,